Numerical Investigation on the Muzzle Blast of Aircraft Gun

Abstract

When the aircraft gun is fired in flight, some complicated physical phenomena may occur. Base on the three dimensional Euler equations and multi-block structured grids, the muzzle flowfield of aircraft embedded guns in four different shooting conditions were simulated numerically by using Ansys Fluent software. These conditions include the shooting in the static environment and the inflow with different velocity. The expanding, reflecting and diffracting process of muzzle blast were discussed in detail. In addition, the numerical results revealed the generation and propagation of the separating shock which was induced by the intense interaction between muzzle jet flow and supersonic inflow. Furthermore, the characteristics of structural change of the muzzle blast were also discussed in these different shooting conditions as well as its blast intensity on the aircraft surface.